Porsche 718 Cayman GT4
Reliability, estimated running costs, and MOT data across 3 model years from 1,543 MOT tests in 2024.
Avg Pass Rate
97%
Total Tests
1,543
Highest Pass Rate
2020 (98%)
Years Covered
3
About the Porsche 718 Cayman GT4
The Porsche 718 Cayman GT4 was MOT tested 1,543 times in 2024 (DVSA data, retests included) across 3 model years (2019 to 2021), with an average pass rate of 97%. That's comfortably above the average of 82% across all models in our data. Our records list petrol versions.
Best and Worst Years
Of the years with at least 100 tests, the 2020 model has the highest pass rate at 98% from 1,017 tests. The 2021 model has the lowest at 95%. With just a 3 point gap, pass rates are similar across these years. Newer cars usually pass more often simply because they are younger.
Reliability Trend
The Porsche 718 Cayman GT4 has maintained consistent MOT pass rates across model years, varying by only 1 percentage point.
Mileage Across Years
The oldest model in our data (2019) averages 12,972 miles, while the newest (2021) averages 9,270 miles.
Compared to the Porsche brand average of 92%, the 718 Cayman GT4 performs 5 points better, making it one of the more reliable options in the Porsche range.
Estimated Running Costs
Based on 7,400 miles/year, average pump prices of 174.57p petrol and 199.33p diesel (GOV.UK weekly road fuel prices, week of 19 October 2026), and MOT pass rate data. Insurance not included.
Full 2021 detailsHow reliable is the Porsche 718 Cayman GT4?
Porsche 718 Cayman GT4 by Year
Click any year to see detailed running costs, reliability data, and comparisons with similar cars.
Questions about the Porsche 718 Cayman GT4
Is the Porsche 718 Cayman GT4 reliable?
Across its 3 model years in our data (2019 to 2021), the Porsche 718 Cayman GT4 averages a 97% MOT pass rate, from 1,543 tests (DVSA MOT data for tests in 2024, retests included). That's 15 points above the average of 82% across all models in the same data. The 2020 model has the highest pass rate of the years with at least 100 tests, at 98%.
Which year Porsche 718 Cayman GT4 has the best MOT pass rate?
Of the years with at least 100 tests, the 2020 Porsche 718 Cayman GT4 has the highest MOT pass rate at 98%, while the 2021 model has the lowest at 95%, a 3 point gap. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.
Are newer Porsche 718 Cayman GT4s more reliable?
The Porsche 718 Cayman GT4 has maintained consistent MOT pass rates across model years, varying by only 1 percentage point.
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